The best definition of false consensus is:

A tendency to think that other people are thinking the same thing you are thinking without real evidence.

The tendency to place excessive emphasis on information that is hard to obtain and place less emphasis on information that is readily available.

The tendency to place excessive emphasis on information that is easily available and place less emphasis on information that is hard to obtain.

A tendency to avoid the unknown.

Being unable to account for new information in a correct way and becoming anchored to a previous price or other value.